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How is the constant torque of a permanent magnet DC motor different from constant power?

The number of clicks: Updated: 2017-09-18 15:05:09 [ close ] share:
    How is the constant torque of a permanent magnet DC motor different from constant power?

    Permanent magnet DC motors have constant torque or constant power. You can't just look at the motor, but also the control system.

    In the speed regulation system of non-independently excited DC motor with speed loop, voltage loop and current loop, these two operating states are available.

    When the magnetic field is constant and the armature current is constant, the speed is adjusted by changing the armature voltage for constant torque speed control. At this time, the running state is constant torque operation. Above the base speed, when the field weakening speed is increased, the armature voltage is constant, and the speed is adjusted by changing the magnetic field excitation to adjust the speed for constant power. The operating state at this time is constant power operation. If it is not to keep the armature current constant, just turn it on when it is powered on, and stop it when it is powered off, and the torque and current will fluctuate with the load. If you use a DC permanent magnet brushed motor, the magnetic field is constant. If your control system has current control, you can keep the armature current constant and adjust the speed by changing the armature voltage.


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